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Finding the Fourth Proportional to 925.20, 1,385.55 and 491.40

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Solution

The fourth proportional to 925.20, 1,385.55 and 491.40 is: 735.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.20 : 1,385.55 = 491.40 : x
  2. Step 2: Convert to fraction form
    925.20/1,385.55 = 491.40/x
  3. Step 3: Cross multiply
    925.20x = 1,385.55 × 491.40
  4. Step 4: Simplify right side
    925.20x = 680,859.27
  5. Step 5: Solve for x
    x = 680,859.27/925.20
  6. Step 6: Final answer
    x = 735.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.